﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace UTIL
{
    public class 播放类
    {
        #region 播放函数
        [Flags]
        public enum PlaySoundFlags : int
        {
            SND_SYNC = 0x0000,    /* play synchronously (default) */ //同步 
            SND_ASYNC = 0x0001,    /* play asynchronously */ //异步 
            SND_NODEFAULT = 0x0002,    /* silence (!default) if sound not found */
            SND_MEMORY = 0x0004,    /* pszSound points to a memory file */
            SND_LOOP = 0x0008,    /* loop the sound until next sndPlaySound */
            SND_NOSTOP = 0x0010,    /* don't stop any currently playing sound */
            SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
            SND_ALIAS = 0x00010000, /* name is a registry alias */
            SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
            SND_FILENAME = 0x00020000, /* name is file name */
            SND_RESOURCE = 0x00040004    /* name is resource name or atom */
        }
        //WAV
        [DllImport("winmm")]
        private static extern bool PlaySound(string szSound, IntPtr hMod, PlaySoundFlags flags);

        //mp3
        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
        private static extern int mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);     
        
        //关闭
        private static void Stop()
        {
            mciSendString("close media", "", 0, 0);
        }

        //播放 MP3
        public static void Play(string strFileName)
        {
            if (System.IO.Path.GetExtension(strFileName).ToLower() == ".wav")
            {
                PlaySound(strFileName, IntPtr.Zero, PlaySoundFlags.SND_SYNC);
            }
            else
            {
                Stop();
                string buf = "";
                buf = buf.PadLeft(128, ' ');
                strFileName = "open " + Convert.ToChar(34) + strFileName + Convert.ToChar(34) + " alias media";
                //初始化音频文件 
                mciSendString(strFileName, buf, buf.Length, 0);
                //播放音频文件 
                mciSendString("play media", buf, buf.Length, 0);
            }
        }
        #endregion             
    }
}
